World's most polluted cities

POSTED: 09:23 AM PST Jan 14, 2013    UPDATED: 06:22 AM PDT Mar 29, 2013 

Take a look at some of the world's most polluted cities, as ranked and compiled by Time, the Blacksmith Institute and ABC Environment.

Most Polluted - Linfen
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Linfen, China -- One of China's most polluted cities, Linfen sits in the heart of the country's coal belt. The hills are dotted with mines, both legal and illegal, and the air is filled with burning coal. Hanging laundry is known to turn black before it dries.

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